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Articles by A. Mondal
Total Records ( 3 ) for A. Mondal
  A. Mondal , G. Kabir , N. Yasmin , A.M.S. Alam and H.A. Khatun
  The present investigation on ten species of Ipomoea was made from mutative points of view. For testing the mutagenic effectiveness of ten Ipomoea species their fresh leaves were used and the test was made on root tip cells of onion. Five different concentrations of the leaf extracts and two different treatments were considered. Cytological observations revealed that all the doses of leaf extracts caused mitotic anomalies. The anomalies were observed mostly at metaphase, anaphase and telophase. Bridge and ring chromosomes were common at anaphase. Few anomalies like c-metaphase, fragments and laggards were also observed. The frequency and type of abnormalities caused due to mutagenic effect of the leaf extracts of ten Ipomoea species were recorded under different treatment duration and doses. DMRT indicated the highest mutagenicity due to aqueous extract of I. carnea and lowest due to I. aquatica. In the present investigation, it was observed that mitotic anomalies increased with an increase of the doses and treatment duration. The overall doses of I. aquatica leaf extracts showed negligible anti-mitotic effects in Allium cepa roots compared to that of other Ipomoea species.
  A. Mondal , G.P. Ghosh and M.I. Zuberi
  Collections of two different types of wild kakrol and cultivated kakrol were grown in the experimental field, described and identified. The two wild kakrol types were detected as Momordica dioica (small fruit type) and M. cochinchinensis (big fruit type), while the cultivated type was found to posses similarities and dissimilarities with both the types. Genetic analysis indicated that the cultivated kakrol as completely isolated from both the wild kakrol species. The big fruited M. cochinchinensis is phylogenetically more different than M. dioica from cultivated kakrol. Both pre-and post-zygotic isolation has been indicated. However, cultivated kakrol and M. dioica proved to be isolated more by post-zygotic mechanisms. The hybrids could be recovered at a low rate which were sterile and failed to reproduce successfully. The cultivated kakrol this proposed a separate status. The name Momordica hybrida has been proposed as the cultivated kakrol has traits common to both the wild types, seemed to be an amphidiploid arising from M. dioica and M. cochinchinensis. Morphological characters of the cultivated type are common to both of the species: Cochinchinensis and Dioica. Large leaf, white flower, eye spot at petal, base, gland absent in leaves, position of bract, cylindrical fruits, grey-black sculptured seed length of petiole, 2-fid filament, fruit size. The sterility of the progeny from crosses supported this view in that two wild kakrol types are diploid and the cultivated kakrol derived tetraploid. The scope of tissue culture in rescuing the hybrid embryos gave somewhat negative result. The wild kakrol types were observed to set fruits and seeds normally in nature. The cultivated kakrol flowers lack pollinations and need artificial pollen transfer. The presence of pollinator guides as bright spots near the petal base suggest possibility of origin at a stable insect pollinator.
  A. Mondal , G. Kabir , G.P. Ghosh , N. Yasmin , A.M.S. Alam and H.A. Khatun
  Morphological variations among all the ten species of Ipomoea were observed both qualitative and quantitatively. Thirteen quantitative characters were taken into consideration and their mean values were compared statistically. Comparative analysis revealed variations from species to species. Qualitative characters concerned with root/tuber, stem/leaf, flower and capsule/seed were examined. Almost all the species of Ipomoea are of herbaceous and climbing habit except I. aquatica, it is amphibious in nature. Most of the species showed leaves to be lobed with various shape such as ovate-oblong, cordate, broadly ovate, ovate-cordate etc. except I. quamoclit where the leaves were found to be pinnately paired and cut up to the midrib. Flowers were observed to be few in axillary cymes in most of the species and in few species flowers were many in terminal cymes, except I. pes-tigridis where the flowers were head like involucrate in auxillary cymes. On the other hand, seed colours were also found to vary but slightly in the species of Ipomoea examined in the present investigation.
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